Fixes #12204 - Show interface form helptext in popovers

Refs #12204 - Resize interface modal, fields and labels

To cause virtual network settings to display correcty changes were also needed
in the layout of the compute attribute forms.

fixes #10130 - availability zones should be available in open stack

refs #4521 - extract string, fix capitalisation

refs #4521 - Openstack Compute Resource: Boot from Volume on new Host

Fixes #9480 - multiple NICs integration with compute profiles

From users point of view:
- interfaces setup in compute profiles is back
- interface related compute attrs get merged into host NICs upon compute
profile selection
- NIC overview table displays details in the column "Type"...